Adds child_source to source as a "polled" source; when source is
added to a GMainContext, child_source will be automatically added
with the same priority, when child_source is triggered, it will
cause source to dispatch (in addition to calling its own
callback), and when source is destroyed, it will destroy
child_source as well. (source will also still be dispatched if
its own prepare/check functions indicate that it is ready.)
If you don't need child_source to do anything on its own when it
triggers, you can call g_source_set_dummy_callback() on it to set a
callback that does nothing (except return TRUE if appropriate).
source will hold a reference on child_source while child_source
is attached to it.
Since 2.28
Adds child_source to source as a "polled" source; when source is added to a GMainContext, child_source will be automatically added with the same priority, when child_source is triggered, it will cause source to dispatch (in addition to calling its own callback), and when source is destroyed, it will destroy child_source as well. (source will also still be dispatched if its own prepare/check functions indicate that it is ready.) If you don't need child_source to do anything on its own when it triggers, you can call g_source_set_dummy_callback() on it to set a callback that does nothing (except return TRUE if appropriate). source will hold a reference on child_source while child_source is attached to it. Since 2.28